Fiber Cable Protection Using Encoded Soil Vibrations
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Solution Overview
Problem
Existing distributed acoustic sensing (DAS) systems rely on passive detection of excavation work, which is inaccurate due to environmental noise interference, and fail to provide early warning for potential damage to fiber infrastructure.
Innovation Solution
An apparatus that actively provides vibrations to the soil at an excavation site with a predefined message, using fiber cables as sensors to detect and derive the message from the resulting vibrations, enabling early warning and preventive measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If passive detection is used to detect excavation work, then the system can monitor vibrations, but the accuracy is limited due to environmental noise interference
Solution Approach 1:
The patent applies mechanical vibration by actively generating vibrations at the excavation site and using fiber optic cables as sensors to detect these vibrations. The vibrations carry encoded information about the excavation work, allowing for accurate detection despite environmental noise. The fiber optic cables convert mechanical vibrations into optical signals for analysis.
Solution Approach 2:
The patent uses fiber optic cables as an intermediary medium between the vibration source and the detection system. The fiber optic cables transmit vibration information as optical signals, providing a noise-resistant transmission path that isolates the detection process from environmental noise interference.
2Reliability
If passive detection is used, then the system monitors vibrations, but it fails to provide early warning for potential damage
Solution Approach 1:
The patent implements preliminary action by actively generating and transmitting vibration signals before excavation work begins. These pre-coded vibration signals serve as early warning system that can detect excavation activities in advance, allowing operators to take protective measures before potential damage occurs to fiber infrastructure.
3Reliability
If active vibration transmission is used, then early warning is enabled, but the system complexity increases
Solution Approach 1:
The patent applies self-service by using the fiber optic cables that already exist in the infrastructure for dual purposes: both as the communication medium and as the vibration sensing element. This eliminates the need for separate sensor installations and reduces system complexity while enabling early warning capability.
Solution Approach 2:
The patent implements multi-functionality by making the fiber optic cables serve multiple functions: they act as both the communication transmission medium and the vibration sensing element. This universal use of existing infrastructure reduces the need for additional specialized equipment, thereby reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate detection and early warning of excavation activities, allowing operators to take preventive actions to protect fiber infrastructure by actively transmitting messages through soil vibrations.
Implementation Method 1
Distributed Acoustic Sensing (DAS) utilizes an optical fiber cable to obtain sensing data associated with vibration signals along the fiber cable
Data Source
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AI summary
The present invention discloses a first apparatus comprising means for: providing vibrations to the soil at a location of an excavation work, wherein the vibrations carry a predefined message related to the excavation work. The present invention discloses a second apparatus, comprising means for: obtaining data of vibrations associated with a fiber cable at a location of an excavation work; wherein the data comprises amplitude and frequency of the vibrations over time; wherein the means are further configured for: deriving, from the obtained data, a predefined message related to the excavation work.